Insulated pipe-joint.



0. H. I A. F. PIEPER.

INSULATED PIPE JOINT.

APPLICATION FILED oc.4. 1915.

1,230,218. Patemed June 19, 1917.

S21-il@ I l I l u I 4 l l l I I l I N WIM/8858:

f i 05am/bww UNrrED s'rATEs PATENT OFFICE.

OSCAR E. PIEPER AND ALPHONSE PIEPER, OF ROCHESTER, NEW YORK.

INSULATED PIPE-JOINT.

Specification of Letters Patent.

Patented J une 19, 1917.

Application led October 4, 1915. Serial No. 53,952.

To all whom t may concern.'

Be it known that we, OSCAR IVI. PIEPER i and ALPHONSE F. PIEPER, both of Rochester, in the county ofMonroe and y State of New York, have invented certain new and useful Improvements in Insulated Pipefloints; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

Our invention has for its purpose to af-l as will be hereinafter more fully described,

the novel features being pointed out in the claims at the end ofthe specification.

In the drawings:

Figure l is a side elevation, partially in' section, showing the application of the invention to a hot air syringe such as used in dental work, and

Fig. 2 is an enlarged sectional view of the joint.

Similar reference numerals in the several figures indicate the same parts.

The invention may be carried out in a number of different ways, and in order to show a preferred manner of constructing and applying it, the present vapplication illustrates a hot air syringe for dental use of a type adapted to be connected with a source of. air supply under pressure, and having provision for heating the air by means of an electrically heated coil or similar unit with which the air is brought in contact, and it is the present intentionl to provide a separable joint for connecting from a flexible tube on to the air supply pipe, and also maintaining the electric circuit that controls the air heating means. The -latter forms no part oi the present improvements, so that it is unnecessary to be shown or described in detail.

The structure shown comprises a. head or hand portion 1 provided with 'a discharge nozzle '2 and connected by a flexible tubing 3, preferably of rubber, to a conducting member or sleeve 4 which is connected with an air supply passage 5 by means of the joint that will now be set forth in detail. 6 designates a hollow connection which is insulated from pipe-,f5 by an insulating sleeve 7, which preferably surrounds and is attached to the connection 6, while 8 is a set screw which holds the insulating sleeve 7 in engagement with the connection 6, and to -which one of the circuit conductors may be attached, the insulating sleeve 7 being threaded onto the pipe' 5.

The conducting member or sleeve 4, already referred to, has a shoulder 10 that supports an insulating sleeve 11, while the latter is also provided with a shoulder on which is mounted a connection 12. The connection 12 is provided with a tapered extremity 13, which engages a corresponding seat 14 on the connection 6, so that the two can be brought into such close and tight engagement as to a'ord a joint that is completely fluid tight. The inner end of the conducting member or sleeve 4 is threaded eXteriorly to receive a conducting member or sleeve 15 which is likewise threaded and is attached to the insulating sleeve 7 b v means of a set screw 16 to which is connected the other side of the electrical circuit. Thus by rotating the sleeve 4 with relation to the sleeve 15, the connection 12 is brought into. tight engagement with the seat, and the connection 6, forming a perfect joint, and a continuous passage for the fluid in the pipe. The insulating sleeve 7 carries a conducting sleeve 17, which extends downwardly and forms a housing for a spring 18, employed to protect the rubber tubing where it is subjected to much bending.

We claim as our invention:

1. In an insulated pipe joint, the combination with a hollow connection having a surrounding insulating member attached thereto, a conducting member securedI to the insulating member, a second conducting portion in engagement with the rst named conducting portion and having an interlorly formed shoulder, an insulating sleeve secured within the last named conducting portion against the shoulder and prov1ded with a second shoulder, and a second hollow connection abutting the last mentioned shoulder and having a tapered end itting a corresponding seat on the irst mentioned hollow connection.

2. An insulated pipe joint comprising a pair of hollow connections having engagement with each other and formed of conducting material, insulating sleeves attached to the hollow connections, conducting members secured to the insulating sleeves and having engagement With each other, Where? by the hollow connections can be brought into tight engagement With each other, and

a portion on one of the insulating sleeves extending around the conducting members whereby the latter are arranged between 15 the respective insulating sleeves aforesaid.

OSCAR H. PIEPER. ALPHONSE F. PIEPER.

Witnesses:

R. M. WRIGHT, F. I. WILSON. V. R. HUMPHREYS, J. H. KLINE. 

